It's a bad idea to have different RAM-sticks in one machine. If you feel you need more than the existing 8GB (really? why?) buy 2 new 8GB sticks (if your machine supports that) for a total of 16 GB.
That's only beneficial if your current 8GB is a limiting factor for the performance. We don't know. You do, by checking the current memory usage in Task Manager.
Is it possible to upgrade my computer with this RAM chip and is it actually beneficial or not? Was thinking of swapping it for one the 4GB ones.
RAM Chip I have - http://www.crucial.com/usa/en/ct102464bf160b
PC Specs - https://support.hp.com/gb-en/document/c05407441